Corresponding stickers (6)
I believe the answer is:
stamps
'corresponding stickers' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Maybe they are linked in a way I don't understand?
This is all the clue.
Can you help me to learn more?
(Other definitions for stamps that I've seen before include "Philatelists collect them" , "Postal tokens" , "Items of interest to a philatelist" , "Brings foot down heavily onto the ground" , "Tokens stuck on letters" .)